In TTY, my login prompt has got a strange and annoying behaviour: with my arrow keys, I can move the cursor everywhere on the screen, including the prompt itself, the welcome message, etc. If I press the del key, the character under the cursor is replaced by a black space. It also happens with my login name, so if I make a misprint, I cannot correct it and the tty becomes useless. What should I do?
Running openSuSE Leap 15.1 on x86-64.
This isn't strange. The terminal device simply has echo on with the echoctl flag set off in the line discipline. Usually the terminal device line discipline is reset to a "sane" state by whatever program opens the terminal and chains to login, which varies wildly in the general case but is likely one of the many getty programs in your case. (Other possibilities are systemd or vc-reset-tty, for example; or ttymon if one is going beyond Linux operating systems.) Find out what program you are using, and why it is not resetting echoctl.
vc-reset-tty. nosh Guide. Softwares.